Stator of an alternating current motor

ABSTRACT

A stator includes an integrated yoke with upper and lower insulators provided on upper and lower ends thereof and stator coils directly wound around the insulators and the yoke. Wherein the yoke has an outer annular member and an inner annular member integrally formed therewith. The upper and lower insulators respectively have two outer rings and two inner rings integrally formed therewith corresponding to the outer and inner annular members of the yoke. Whereby the structure of the stator is simple and manufacturing of the stator is efficient.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a stator of an alternatingcurrent motor, particularly to the stator having an integrated yoke withstator coils directly wound thereon so as to simplify the structure ofthe stator.

[0003] 2. Description of Related Art

[0004] Various kinds of alternating current motors are widely used inalmost all fields of industry. The speed and torsion of the alternatingcurrent motor depends on phases of the stator and the rotor of themotor. A conventional stator of the alternating current motor normallyhas a complicated structure which results in a complicated productionprocess. For example, as shown in FIGS. 5 and 6, a conventional stator(50) comprises a yoke (51), a winding core (52) fitted in a centralcavity of the yoke (51) and symmetrically integrated with two protrudedportions (521) at two opposite sides thereof, two insulators (53)respectively provided at opposite ends of the winding core (52), and twostator coils (60) respectively wound around the insulators (53) and theprotruded portions (521) of the winding core (52).

[0005] The defect of the conventional stator of the alternating currentmotor is that because the structure of the stator, the stator has atleast two components in addition to the insulators (53) and the statorcoils (60), thus the production process of the stator must becomplicated and the production cost of the stator must be expensive.

[0006] Therefore, it is an objective of the invention to provide animproved stator of alternating current motor to mitigate and/or obviatethe aforementioned problems.

SUMMARY OF THE INVENTION

[0007] The main object of the present invention is to provide a statorhaving a simplified structure, wherein the stator has an integrated yokewith the stator coils directly wound thereon so as to simplify thestructure of the stator.

[0008] Other objects, advantages and novel features of the inventionwill become more apparent from the following detailed description whentaken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]FIG. 1 is an exploded perspective view of a stator of an AC motorin accordance with the invention;

[0010]FIG. 2 is a perspective view of the stator of the AC motor inaccordance with the invention;

[0011]FIG. 3 is a plan view of the stator of the AC motor in accordancewith the invention;

[0012]FIG. 4 is a cross sectional view along line 4-4 in FIG. 3 of thestator of the AC motor in accordance with the invention;

[0013]FIG. 5 is an exploded perspective view of a conventional stator ofan AC motor; and

[0014]FIG. 6 is a perspective view of the conventional stator of themotor.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0015] As shown in FIGS. 1 and 2, a stator comprises an integrated yoke(10), upper and lower insulators (20, 21) respectively provided at upperand lower ends of the yoke (10), and two joint keys (30) provided at twoopposite sides of the yoke (10).

[0016] The yoke (10) is integrally formed with an outer annular member(11) and an inner annular member (12), and symmetrically defined withtwo winding slots (13) disposed between the outer and inner annularmembers (11, 12) at two opposite lateral sides thereof. Two cut-outs(14) are symmetrically defined at two opposite sides of the outerannular member (11) and respectively communicated with middle positionsof the winding slots (13).

[0017] The upper and lower insulators (20, 21) are formed in anidentical shape substantially corresponding to the shape of the yoke(10) and symmetrically assembled on the upper and lower ends of the yoke(10). The upper and lower insulators (20, 21) respectively have twoouter rings (201, 211) and two inner rings (202, 212) integrally formedtherewith, two pairs of slots (203, 213) defined at opposite sidesthereof corresponding to the winding slots (13) of the yoke (10), andtwo pairs of openings (204, 214) defined at opposite outer sides thereofcorresponding to the cut-outs (14) of the yoke (10).

[0018] Peripheries of upper ends of the outer rings (201) andperipheries of lower ends of the outer rings (211) are respectivelyformed with outer edges (205, and 215) therearound. Peripheries of upperends of the inner rings (202) and peripheries of lower ends of the innerrings (212) are respectively formed with inner edges (206, and 216)therearound. Peripheries of lower ends of the slots (203) andperipheries of upper ends of the slots (213) are respectively formedwith joint edges (207, 217) therearound.

[0019] Whereby the upper and lower insulators (201, 211) arerespectively assembled on upper and lower ends of the yoke (10) by meansof the joint edges (207, 217) respectively inserted into thecorresponding winding slots (13). As illustrated in detail in FIGS. 3and 4, the joint edges (207, 217) are combined together in the windingslot (13) to form a passage for receiving of wires of stator coils (40).The wires of the stator coils (40) are respectively extended through theopenings (204, 214) and cut-outs (14) into passages combined by thejoint edges (207,217) and wound around the upper and lower insulators(20, 21) to bind the upper and lower insulators (20, 21) together withthe yoke (10). After the stator coils (40) are wound, the joint keys(30) are respectively fixed into the cut-outs (13) of the yoke (10),such that a stator is easily produced.

[0020] The advantage of the invention is that because the yoke (10) ofthe stator is formed in an integrated member, the stator coils (40) aredirectly wound around the yoke (10), and the stator (10) has fewercomponents than those of the conventional stator, so that the productioncost of the stator (10) of the invention is no more than that of theconventional stator, yet the cost is low due to the smaller number ofcomponents in the present invention.

[0021] Another advantage of the invention is that the upper and lowerinsulators (20, 21) are easily assembled on the yoke (10) by simplyinserting the joint edges (207, 217) into the winding slots (13), andthe stator coils (40) are able to be directly wound around the upper andlower insulators (20, 21) and bound together with the yoke (10), wherebythe assembly of the stator is simplified, so that the productionefficiency of the stator (10) is increased.

[0022] It is to be understood, however, that even though numerouscharacteristics and advantages of the present invention have been setforth in the foregoing description, together with details of thestructure and function of the invention, the disclosure is illustrativeonly, and changes may be made in detail, especially in matters of shape,size, and arrangement of parts within the principles of the invention tothe full extent indicated by the broad general meaning of the terms inwhich the appended claims are expressed.

What is claimed is:
 1. A stator of an alternating current motor, thestator comprising: a yoke (10) having an outer annular member (11) andan inner annular member (12) integrally formed therewith, two windingslots (13) symmetrically defined at two opposite lateral sides betweenthe outer and inner annular members (11, 12), and two cut-outs (14)symmetrically defined at two opposite sides of the outer annular member(11) and respectively communicating with middle positions of the windingslots (13); upper and lower insulators (20, 21) respectively assembledon upper and lower ends of the yoke (10), and respectively having twoouter rings (201, 211) and two inner rings (202, 212) integratedtherewith corresponding to the outer and inner annular members (11, 12),two pairs of slots (203, 213) respectively defined at opposite sidesthereof corresponding to the winding slot (14) of the yoke (10), and twopairs of openings (204, 214) respectively defined at opposite sides ofthe outer rings (201, 211) corresponding to the cut-outs (14); wherebyafter the upper and lower insulators (20, 21) are respectively assembledon upper and lower ends of the yoke (10), wires of stator coils arerespectively wound around the upper and lower insulators (20, 21) andbind the upper and lower insulators (20, 21) together with the yoke(10).
 2. The stator as claimed in claim 1, wherein upper ends of theouter rings (201) and inner rings (202) of the upper insulator (20) arerespectively formed with bulged outer edges (205) around outer sidesthereof and bulged inner edges (206) around inner sides thereof, lowerends of the outer rings (211) and inner rings (212) of the lowerinsulator (21) are respectively formed with bulged outer edges (215)around outer sides thereof and bulged inner edges (216) around innersides thereof, the lower ends of the slots (203) and upper ends of theslots (213) are respectively formed with bulged joint edges (207, 217)therearound, whereby the upper and lower insulators (20, 21) arerespectively assembled on the yoke (13) by means of the joint edges(207, 217) respectively inserted into the corresponding winding slot(14) of the yoke (10).
 3. The stator as claimed in claim 1, wherein twojoint keys (30) are respectively fixed into the two cut-outs (14) of theyoke (10).